This might be old news for some of you, but i just watched this video http://www.youtube.com/watch?v=Lm0azEG0CPY but don't really understand how the warhead's
designed?

On the test firing against the brick wall, the results are what i'd expect from a HESH type warhead.

On the test firing against the reinforced concrete wall, i got the impression that it has kind of the same function as the Bunkerfaust(HEAT charge blows a hole, follow-through grenade enters hole and kills everyone on the other side of the wall)and similar weapons.

There is clearly reference to two warheads in the projectile, both in the name of the weapon(AST stands for Anti Structure Tandem)and in the video, and two modes of function(1)both warheads go off simultaneously 2)one of the warheads has a delayed exposion). What are the two warheads comprised of?
Is there a HEAT charge of some kind in the precursor warhead or isn't it?

Also, a quote from http://www.special-operations-technology.c...cfm?DocID=1998;

“The AST will provide a lot of things,” he continued. “It has two modes in the warhead: one short delay and one long delay. And with the short delay you detonate the charge in the wall, so you can open up a corridor or a new entrance. And if you put in a long delay it will pass the wall and detonate behind it.”

“And it has a ‘novel explosive’ in the main follow-through charge,” he added. “Not in the precursor but in the main charge. And it uses PBX explosive as well.”
End quote.

Does `novel explosive´ in the case of the AT4 AST mean the same thing as `novel explosive´ in the case of the SMAW-NE(ie thermobaric/fuel-air)?